updated CG*Zero values to CG*.zero

Sources/iOS/ControlView.swift

@@ -33,7 +33,7 @@ import UIKit
 public class ControlView : MaterialView {
 	/// Will render the view.
 	public var willRenderView: Bool {
-		return 0 < width
+		return 0 < width && 0 < height
 	}
 	
 	/// A preset wrapper around contentInset.

Sources/iOS/Material+UIImage+FilterBlur.swift

@@ -52,7 +52,7 @@ public extension UIImage {
 		var effectImage: UIImage = self
 		
 		let screenScale: CGFloat = MaterialDevice.scale
-		let imageRect: CGRect = CGRect(origin: CGPointZero, size: size)
+		let imageRect: CGRect = CGRect(origin: CGPoint.zero, size: size)
 		let hasBlur: Bool = blurRadius > CGFloat(FLT_EPSILON)
 		let hasSaturationChange: Bool = fabs(saturationDeltaFactor - 1.0) > CGFloat(FLT_EPSILON)
 		

Sources/iOS/MaterialCollectionViewLayout.swift

@@ -32,10 +32,10 @@ import UIKit
 
 public class MaterialCollectionViewLayout : UICollectionViewLayout {
 	/// Used to calculate the dimensions of the cells.
-	internal var offset: CGPoint = CGPointZero
+	internal var offset: CGPoint = CGPoint.zero
 	
 	/// The size of items.
-	public var itemSize: CGSize = CGSizeZero
+	public var itemSize: CGSize = CGSize.zero
 	
 	/// A preset wrapper around contentInset.
 	public var contentInsetPreset: MaterialEdgeInset = .None {
@@ -48,7 +48,7 @@ public class MaterialCollectionViewLayout : UICollectionViewLayout {
 	public var contentInset: UIEdgeInsets = UIEdgeInsetsZero
 	
 	/// Size of the content.
-	public private(set) var contentSize: CGSize = CGSizeZero
+	public private(set) var contentSize: CGSize = CGSize.zero
 	
 	/// Layout attribute items.
 	public private(set) var layoutItems: Array<(UICollectionViewLayoutAttributes, NSIndexPath)> = Array<(UICollectionViewLayoutAttributes, NSIndexPath)>()

Sources/iOS/MaterialDepth.swift

@@ -45,7 +45,7 @@ public enum MaterialDepth {
 public func MaterialDepthToValue(depth: MaterialDepth) -> MaterialDepthType {
 	switch depth {
 	case .None:
-		return (offset: CGSizeZero, opacity: 0, radius: 0)
+		return (offset: CGSize.zero, opacity: 0, radius: 0)
 	case .Depth1:
 		return (offset: CGSizeMake(0, 1), opacity: 0.3, radius: 1)
 	case .Depth2:

Sources/iOS/MaterialTextLayer.swift

@@ -201,7 +201,7 @@ public class MaterialTextLayer : CATextLayer {
 				return v.stringSize(text!, constrainedToWidth: width)
 			}
 		}
-		return CGSizeZero
+		return CGSize.zero
 	}
 	
 	/**

Sources/iOS/Menu.swift

@@ -97,7 +97,7 @@ public class Menu {
 	
 	/// Convenience initializer.
 	public convenience init() {
-		self.init(origin: CGPointZero)
+		self.init(origin: CGPoint.zero)
 	}
 
 	/// Reload the view layout.

Sources/iOS/NavigationBar.swift

@@ -290,11 +290,11 @@ public class NavigationBar : UINavigationBar {
 	public override func intrinsicContentSize() -> CGSize {
 		switch navigationBarStyle {
 		case .Tiny:
-			return CGSizeMake(width ?? MaterialDevice.width, 32)
+			return CGSize(width: width ?? MaterialDevice.width, height: 32)
 		case .Default:
-			return CGSizeMake(width ?? MaterialDevice.width, 44)
+			return CGSize(width: width ?? MaterialDevice.width, height: 44)
 		case .Medium:
-			return CGSizeMake(width ?? MaterialDevice.width, 56)
+			return CGSize(width: width ?? MaterialDevice.width, height: 56)
 		}
 	}
 	

Sources/iOS/NavigationDrawerController.swift

@@ -319,7 +319,7 @@ public class NavigationDrawerController : RootController, UIGestureRecognizerDel
 	this, and to add a hidden transition viewController for complex
 	situations, the contentViewController was added.
 	*/
-	public private(set) var contentViewController: UIViewController?
+	public private(set) lazy var contentViewController: UIViewController = UIViewController()
 	
 	/**
 	A UIViewController property that references the 
@@ -861,11 +861,9 @@ public class NavigationDrawerController : RootController, UIGestureRecognizerDel
 	
 	/// Prepares the contentViewController.
 	private func prepareContentViewController() {
-		if nil == contentViewController {
-			contentViewController = UIViewController()
-			contentViewController!.view.backgroundColor = MaterialColor.black
-		}
+		contentViewController.view.backgroundColor = MaterialColor.black
 		prepareViewControllerWithinContainer(contentViewController, container: view)
+		view.sendSubviewToBack(contentViewController.view)
 	}
 	
 	/// A method that prepares the leftViewController.

Sources/iOS/RootController.swift

@@ -129,6 +129,7 @@ public class RootController : UIViewController {
 					s.rootViewController = toViewController
 					s.rootViewController.view.clipsToBounds = true
 					s.rootViewController.view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
+					s.rootViewController.view.contentScaleFactor = MaterialDevice.scale
 					completion?(result)
 				}
 			})
@@ -171,7 +172,6 @@ public class RootController : UIViewController {
 		if let v: UIViewController = viewController {
 			addChildViewController(v)
 			container.addSubview(v.view)
-			container.sendSubviewToBack(v.view)
 			v.didMoveToParentViewController(self)
 			v.view.clipsToBounds = true
 			v.view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]